METHOD PREDICTING TIME OF NO-FAILURE OPERATION OF LIGHT GUIDES Russian patent published in 2002 - IPC

FIELD: measurement technology. SUBSTANCE: invention is related to measurement of degradation parameters of mechanical strength of fiber light guides and to evaluation of time of no-failure operation of light guides on basis of such parameters. Method predicting time of no-failure operation of light guides consists in evaluation of values of mechanical stress σ_s, acting on light guide in process of its operation, in loading of light guide by check tension σ_p1 in the course of time t_p1 by rewinding under load of entire length in standard rewinding machine under normal conditions and in counting number N_p1 of breaks per unit of light guide length, in repeat similar check loading with parameters σ_p2 t_p2 of specially selected section of light guide under normal conditions, in counting number N_p2 of breaks per unit of length of section of light guide, in formation of several statistically similar ensembles of specimens of light guide to carry out tests under normal and service conditions. In addition tests are conducted by loading specimens of light guide formed from ensembles by simultaneous stress of dynamic twisting and static axial tension σ_t under normal and service conditions, values of breaking stress are computed, median values σ_dp0,5 and σ_dsp0,5 of strength under rated and operational conditions, values n_p and n_s of fatigue parameters under normal and service conditions are found, time t_s of no-failure operation of light guide under service conditions is determined by calculation. EFFECT: cut cost of light guide testing. 3 dwg, 3 tbl